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Stereotactic body radiotherapy seems to be feasible, well-tolerated, and a potential alternative to surgery or external beam radiation. Stereotactic body radiotherapy may be a more convenient and effective form of reirradiation given the relatively short time required for delivery of the scheduled treatment fractions.
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PYRESIA
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Reprint requests to: Dwight E. Heron, M.D., F.A.C.R.O., Univer-sity of Pittsburgh Cancer Institute, UPMC Cancer Pavilion, 5150
S. Y. Lais current address is: Department of Head and Neck Sur-gery, University of Texas M. D. Anderson Cancer Center, Houston,TX.
Int. J. Radiation Oncology Biol. Phys., Vol.-, No.-, pp. 18, 2009Copyright 2009 Elsevier Inc.
Printed in the USA. All rights reserved0360-3016/09/$see front matter
doi:10.1016/j.ijrobp.2008.12.075
ARTICLE IN PRESSCentre Avenue, #545, Pittsburgh, PA 15232. Tel: (412) 623-6723;INTRODUCTION
Squamous cell carcinoma of the head and neck (SSCHN) is
the sixth most common malignancy worldwide, with approx-
imately 500,000 cases annually. In the United States, 45,660
new cases and 11,210 deaths were expected in 2007 (1). The
5-year survival rate of 40% for patients with SCCHN in the
United States and other developed countries is comparable
to the 5-year survival rate in the 1970s, despite advances in
detection, surgery, radiation, and chemotherapy (2, 3). Re-
current disease remains a significant problem: nearly 50
60% of these patients will die because of recurrent
locoregional disease (46). Cure rates after recurrence
remain dismal at 16% with single-modality therapy (6).
Chemotherapy has been commonly used for palliation in re-
current disease, with response rates of approximately 30%
and a median survival of 5 to 6 months (7, 8).
Reirradiation of head-and-neck cancers has posed a signif-
icant challenge in the past, given concerns of limited tissue
tolerance (8, 9). Nevertheless, in the setting of recurrent
SCCHN, locoregional disease predominates, and thus the op-
portunity for focused treatment may offer an opportunity for
cure in a subset of patients. Reirradiation has been shown to
produce local control rates of up to 50%, with 5-year survival
of approximately 20% in highly selected cases (6, 913). Un-
fortunately, anticipated tissue complications have been re-
ported as high as 40% with some reirradiation schedulesFax: (412A preli
poster forClinical OPurpose: To evaluate the safety and efficacy of stereotactic body radiotherapy (SBRT) in previously irradiatedpatients with squamous cell carcinoma of the head and neck (SCCHN).Patients and Methods: In this Phase I dose-escalation clinical trial, 25 patients were treated in five dose tiers up to44 Gy, administered in 5 fractions over a 2-week course. Response was assessed according to the Response Eval-uation Criteria in Solid Tumors and [18F]-fluorodeoxyglucose standardized uptake value change on positronemission tomographycomputed tomography (PET-CT).Results: No Grade 3/4 or dose-limiting toxicities occurred. Four patients had Grade 1/2 acute toxicities. Fourobjective responses were observed, for a response rate of 17% (95% confidence interval 2%33%). The maximumduration of response was 4 months. Twelve patients had stable disease. Median time to disease progression was4 months, and median overall survival was 6 months. Self-reported quality of life was not significantly affectedby treatment. Fluorodeoxyglucose PETwas a more sensitive early-measure response to treatment than CT volumechanges.Conclusion: Reirradiation up to 44 Gy using SBRT is well tolerated in the acute setting and warrants furtherevaluation in combination with conventional and targeted therapies. 2009 Elsevier Inc.
Head-and-neck squamous cell carcinoma, Head-and-neck cancer, Stereotactic body radiotherapy, Reirradiation,PET-CT.CLINICAL INVESTIGATION
STEREOTACTIC BODY RADIOTHERACARCINOMAOFTHEHEADANDNECK:
TR
DWIGHT E. HERON, M.D., F.A.C.R.O.,* ROBERT L.REGIANE S. ANDRADE, M.D.,* ERIN L
WILLIAM E. GOODING, M.S.,jj BARTON F. BRANSTJONAS T. JOHNSON, M.D.,y ATHANASSIOS A
AND STEPHEN Y.
Departments of *Radiation Oncology, yOtolaryngology, xRadioMedical Oncology, University of Pi) 647-1161; E-mail: [email protected] analysis of a portion of this study was presented inm at the 43rd Annual Meeting of the American Society ofncology, June 15, 2007, Chicago, IL.
1FOR RECURRENT SQUAMOUS CELLULTSOFAPHASE I DOSE-ESCALATIONL
RIS, M.D., PH.D.,yMICHALIS KARAMOUZIS, M.D.,z
EEB, B.S.,x STEVEN BURTON, M.D.,*ER, M.D.,yx{ JAMES M. MOUNTZ, M.D., PH.D.,x
RIS, M.D.,z JENNIFER R. GRANDIS, M.D.,y
I, M.D., PH.D.y
, jjBiostatistics, and {Biomedical Informatics, and zDivision ofgh Cancer Institute, Pittsburgh, PAConflict of interest: none.Received May 19, 2008, and in revised form Dec 9, 2008.
Accepted for publication Dec 24, 2008.
ARTICLE IN PRESS(10, 11). These studies have demonstrated the relationship of
dose and volume of reirradiated tissue as the major predictor
for treatment-related complications. There is some evidence
that the soft tissues of the head and neck may tolerate reirra-
diation doses as high as 90% of the original dose if delivered
between 6 weeks and 12 months after initial treatment (14
16). Furthermore, reirradiation with either brachytherapy or
external beam yields comparable long-term survival rates
of 1525% (911).
Stereotactic body radiotherapy (SBRT) is a relatively new
technique that can be applied to deliver high doses of radia-
tion to tumors anywhere in the body with greater precision
when compared with other, more conventional techniques.
This can be accomplished by the CyberKnife Precision Radi-
ation Delivery System (Accuray, Sunnyvale, CA), which of-
fers an attractive alternative for the treatment of patients who
have inoperable or surgically complex tumors or those who
have had prior radiotherapy. The device is an image-guided
stereotactic radiosurgery delivery system that does not
require the application of an invasive head frame for cranial
radiosurgery. Other technical specifications of this system
have been previously reported (17). The integrated imaging
and delivery system has been used to treat extracranial dis-
ease, such as primary and metastatic lung and spine tumors
and prostate cancers, as well as head-and-neck cancers (18,
19). Stereotactic body radiotherapy also offers the ability to
deliver fractionated radiosurgical treatment plans for larger
lesions, minimizing the radiation of adjacent healthy tissues
to potentially decrease the rate of complications. We previ-
ously reported our initial experience using this system, which
resulted in local control rates (20) comparable to those with
conventional techniques. On the basis of these promising ret-
rospective findings in a cohort of patients in whom conven-
tional external beam or intensity-modulated radiotherapy
(IMRT) would have been challenging, we designed a Phase
I dose-escalation trial to evaluate the safety, efficacy, and im-
pact on quality of life of SBRT in patients with recurrent,
inoperable SCCHN.
PATIENTS AND METHODS
Between March 2005 and March 2007, we accrued 31 patients
who had previously undergone radiation treatment for SCCHN
and who re-presented with radiologically measurable, recurrent dis-
ease that was deemed to be unresectable and who had Eastern Co-
operative Oncology Group (ECOG) performance status of 02. In
general, SBRT was selected as the choice for reirradiation when
the treating radiation oncologist deemed full-dose re-treatment
(i.e., >60 Gy) with either three-dimensional or IMRT as challengingbecause of proximity to the spinal cord or other critical structures. In
some instances consideration of patient tolerance of a protracted
course of treatment was important, because SBRT treatment deliv-
ered over the course of 10 days was more readily accepted by pa-
tients than a re-treatment course of 6 to 7 weeks. Patients who
received at least 1 fraction of treatment were considered eligible
for toxicity assessment. This Phase I clinical trial (University of
Pittsburgh Cancer Institute no. 04-144) was approved by the Univer-
2 I. J. Radiation Oncology d Biology d Physicssity of Pittsburgh Institutional Review Board, and informed consent
was obtained from each patient.All patients were evaluated with physical examination and cross-
sectional CT imaging. The majority of patients had a combined
[18F]-fluorodeoxyglucose (FDG) positron emission tomography
computed tomography (PET-CT) scan no more than 4 weeks before
enrollment. The Revised University of Washington Quality of Life
Questionnaire (21) was administered to each patient before treat-
ment and 1 month after treatment. This is a self-reported appraisal
of quality of life in which 12 domain-specific items are scored by
the patient from 0 (worst) to 100 (best). These 12 domains are aver-
aged to yield a composite score for each patient.Patients were treated with the CyberKnife Robotic Radiosurgical
System (Accuray). An individualized treatment plan was developed
for each patient according to the clinical and radiographic findings.
The gross target volumewas defined by the radiographic and clinical
areas of known gross disease, augmented by PET-CT when avail-
able. Critical structures were also contoured for exclusion from
treatment. All patients were treated to the 80% isodose line, which
was intended to cover >90% of the target volume. Radiation dose
was administered in 5 fractions over a 2-week period. No chemo-
therapy was given concurrently with SBRT. The dose to all critical
structures other than the spinal cord was not routinely available in
most patients because many of them were initially treated at outside
institutions. In general, critical structure constraints were as follows:
spinal cord maximum dose: #8 Gy; larynx: # 20 Gy; mandible:#20 Gy; parotid: variable; brainstem:#8 Gy; oral cavity: variable.Dose escalation was dictated by a nonparametric adaptive plan
that estimates a dose-limiting toxicity (DLT) rate of 20% for the
maximally tolerated dose. Up to 10 patients were to be treated at
the highest dose (44 Gy) per protocol. Acute toxicity was defined
as occurring during the course of treatment and extending until
3 months after treatment. Chronic toxicity was defined as those
events occurring thereafter. To assess the acute toxicity of each
dose tier, a 4 -week observation period was necessary before esca-
lation to the subsequent tier was allowed.Response assessment was conducted by the head-and-neck radi-
ologist (B.F.B.) and a head-and-neck surgeon (J.R.G.). Response
Evaluation Criteria in Solid Tumors (RECIST) were used for the as-
sessment of response at approximately 30 days for patients with CT
only (n = 4) and 4560 days for those with PET-CT. Tumor size wasbased on CT measurements. Response to PET was based on stan-
dardized uptake values (SUV).The maximum SUV value (SUVmax) in the tumor region defined
by the tumor target volume region of interest (ROI) was measured
both before and after therapy by a radiation oncologist (R.S.A.)
and nuclear medicine radiologists (E.D. and J.M.M.). In addition,
owing to relatively high background SUV values in normal head-
and-neck regions, a background correction SUV (SUVbkg) in an
adjacent but uninvolved neck region ROI was obtained. Fluoro-
deoxyglucose uptake attributable to tumor (SUVtum) was corrected
for background by subtracting SUVbkg from SUVmax. Response
was assessed by comparison between pre- and posttreatment PET
scans according to the criteria proposed by the European Organiza-
tion for Research and Treatment of Cancer (EORTC) PET group
(22). Using this method, we obtained background corrected ratios
of SUVmax in the tumor region before (SUVpre) and after (SUV-
post) therapy to obtain the percentage SUV change in the tumor
as the ratio defined as SUVpost/SUVpre.For PET studies, we categorized the treatment response as pro-
gressive metabolic disease (PMD), stable metabolic disease
(SMD), partial metabolic response (PMR), and complete metabolic
response by grouping the patients percentage SUV change as estab-
Volume-, Number-, 2009lished by the 1999 EORTC recommendations (22). Progressive
metabolic disease is defined as an SUV increase of $25% or new
RESULTS
Patient characteristicsPatient characteristics are outlined in Table 1. Of the 31 (30
male, 1 female) enrolled patients, 25 (81%) completed their
prescribed treatment in 5 equal fractions over a 2-week pe-
riod and were evaluable for response or toxicity. Two
patients died before disease response assessment (one myo-
cardial infarction and one decline in performance status).
Six patients were not evaluable for response for the following
reasons: inability to lay supine for duration of treatment (n =2), patient refusal (n = 2), and unrelated comorbidity (n = 2).
therapy was 13 months (range, 594 months).
Table 1. Patient characteristics
Age (y), median (range) 63 (3586)GenderMale 24Female 1
Primary siteNasopharynx 1Oropharynx 6Larynx 10Oral cavity 7Unknown 1
Tumor volume(cm3), median (range)
44.8 (4.2217)
SBRT for recurrent SCCHN d D. E. HERON et al. 3
ARTICLE IN PRESSFDG-avid areas; SMD is defined as an SUV increase of
Objective response
3 months with a maximum of 4 months.
Table 3. Patient responses by dose tier
Dose (Gy)
Response 25 32 36 40 44 Total
Complete response 1 0 1* 0 0 2Partial response 1* 0 1* 1 2 5Stable disease 0 3 0 3 6 12Progressive disease 0 0 0 2 2 4Not evaluable 1 0 1 0 0 2
* Responses not confirmed.
4 I. J. Radiation Oncology d Biology d Physics
ARTICLE IN PRESSTumor size changes and metabolic response to SBRTPatient SBRT responses were classified by CT volume
changes according to RECIST and by PET metabolic change
according to the EORTC recommendations (Table 4).
Twelve patients had SD by RECIST, but 7 of these patients
showed improvement on PET (PMR), with 2 cases having
had a complete (100%) or near-complete (>90%) resolution
of FDG uptake. However, 2 patients with SD by RECIST
showed PMD on PET. Five patients with PD by RECIST
also showed PMD on PET. Figure 1AD depicts an example
of PET and PET-CT response to SBRT.
In cases of PR, agreement between CT and PET were
mixed. In 2 patients with PR showing a modest decrease inOf the 25 patients completing their therapy, 2 died before
radiographic staging, and the remaining 23 were assessed for
clinical response (Table 3). Among the 23 patients who were
evaluable for response, 1 had a complete response (CR) and 3
had partial response (PR) meeting RECIST definitions, for
a response rate of 17.4% (95% confidence interval [CI]
2%33%). Twelve patients had stable disease (SD), and 4
had progressive disease (PD). Two patients with objective re-
sponses (1 CR, 1 PR) died before a confirmatory scan could
be obtained and therefore did not qualify as response by RE-
CIST. Response rate was independent of dose (p = 0.209) andinitial treated volume (p = 0.306) (Table 2). Median durationof response, including the unconfirmed responses, wasTable 4. Tumor response to SBRT by RECIST and PET
Response RECIST PET
CR/CMR 2 2PR/PMR 5 10SD/SMD 9 1PD/PMD 5 6Total 23 19
Abbreviations:SBRT= stereotactic body radiotherapy;RECIST=Response Evaluation Criteria in Solid Tumors; PET = positronemission tomography; CR = complete response; CMR = completemetabolic response; PR = partial response; PMR = partial metabolicresponse; SD = stable disease; SMD = stable metabolic disease;PD = progression of disease; PMD = partial metabolic disease.the tumor size, PET demonstrated an increase in FDG uptake
suggesting PMD, but these patients ultimately were con-
firmed as PD on subsequent follow-up. Another case consid-
ered PR by CT but SMD by PET with a mild FDG response
(3%) ultimately was confirmed to have persistent disease
with a modest FDG change (38%) on a later PET-CT study.
Additionally, in 2 cases considered PD by CT, a decrease was
observed in the FDG uptake. One patient had a 45% reduc-
tion in FDG avidity, and the subsequent PET-CT study
showed a substantial increase, confirming progression
(PMD). In the other case, a 64% decrease in the FDG was
seen, but this patient developed a new primary lung cancer
and died during treatment without confirmation of disease
response in the neck.
Quality of lifeThe Revised University of Washington Quality of Life
Questionnaire was administered to 24 patients before
SBRT, of whom 16 completed the survey after treatment.
Among those completing the questionnaire at both times,
overall quality of life declined. The median decrease in the
composite score was 10 (two-tailed signed rank test, p =0.0831). Quality of life at baseline and quality-of-life change
with treatment were unrelated to performance status (Krus-
kal-Wallis p = 0.604 and 0.648, respectively). Major self-reported issues affecting 3050% of patients at baseline
were speech, swallowing, pain, and saliva. These issues
persisted after treatment.
Patterns of failurePatterns of failure are important criteria in assessing the
efficacy of treatment, given the highly conformal nature of
SBRT and the concern about marginal misses. Treatment
volumes were created without additional dosimetric margins
(i.e., no planning target volume). Nonetheless, much like ourretrospective experience (20), patients rarely failed exclu-
sively at the boundary of the SBRT field. Rather, all failures
were either entirely within the radiation portal, outside the
field, or a combination of both. Although the prognosis is of-
ten poor in patients with recurrent disease, focused therapy
can offer significant local control and palliation. On the basis
of the tumor treated with SBRT, the observed treatment re-
sponse (radiologic and metabolic: CR + PR + SD) was
76% (19 of 25). However, we were unable to establish a rela-
tionship between dose, tumor size, and probability of local
control in this patient cohort.
SurvivalOf the 23 patients with known disease status, 12 patients
had documented progression, 9 patients died without docu-
mented disease progression, and 2 patients are alive without
progression. The median time to progression was 4 months
(95% CI 46 months; Fig. 2A). The probability of 6-month
disease-free survival was 0.31 (95% CI 0.130.51).
Twenty-three of 25 patients have died. The median overall
survival was 6 months (95% CI 58 months). Two patients
Volume-, Number-, 2009with SD remain alive at 14 and 18.5 months after treatment
cancers, locoregional recurrences remain a significant prob-
Fig. 1. Positron emission tomographycomputed tomography (PET-CT) scans of recurrent squamous cell carcinoma ofmetas
SBRT for recurrent SCCHN d D. E. HERON et al. 5
ARTICLE IN PRESSlem in 5060% of patients. Many of those patients dying
from disease have local or regional disease as the sole site
of failure (2325). Although salvage surgery remains the
mainstay of therapy for the majority of patients with recurrent
disease, some are poor surgical candidates or have unresect-and were treated on dose tier 5 (44 Gy). Figure 2B shows
a Kaplan-Meier plot of overall survival with confidence
bands. Figure 3 shows the SBRT plan for the patient depicted
in Fig. 1. Note the steep dose gradient between the gross tar-
get volume and the adjacent spinal cord.
DISCUSSION
Despite major advances in the treatment of head-and-neck
the head and neck: primary (A, C) and cervical (B, D)body radiotherapy.able disease. For the vast majority of patients with recurrent
head-and-neck cancer, surgical resection remains the single
most important factor in effecting durable salvage. However,
Fig. 2. Progression-free and overall survival. (A) Kaplan-Meicompleting stereotactic body radiotherapy with known diseasintervals. (B) Kaplan-Meier curve depicts overall survival foThe dashed lines represent 95% confidence intervals. Tick marin patients deemed to be unresectable or medically inopera-
ble, other options must be explored. Chemotherapy may pro-
vide meaningful palliation, but few patients achieve durable
control even with multiagent regimens. Although reirradia-
tion has been advocated as a possible modality for salvaging
patients with recurrent disease confined to the head and neck,
it has been discouraged because of concerns over normal tis-
sue complications, including soft-tissue necrosis, fibrosis,
transverse myelopathy/myelitis, and radionecrosis of the
mandible and cartilage of the head and neck.
The introduction of highly conformal techniques such as
three-dimensional conformal radiotherapy (3D-CRT) and
IMRT has renewed interest in aggressive reirradiation pro-
grams. The primary tenets of these programs have been to
limit the size of the radiation field, reduce the re-treatment
tatic disease before (A, B) and after (C, D) stereotacticdoses, and adopt altered fractionation schemes to minimize
toxicity. It is now generally accepted that cytotoxic doses
in excess of 60 Gy are necessary to optimize salvage
er curve depicts progression-free survival for 23 patientse status. The dashed lines represent the 95% confidencer 25 patients completing stereotactic body radiotherapy.ks represent censoring times/events.
for
ARTICLE IN PRESSFig. 3. Representative stereotactic body radiotherapy plangross tumor volume (GTV) and spinal cord.
6 I. J. Radiation Oncology d Biology d Physicsprobability in patients with recurrent SCCHN (12). Reirra-
diation alone has been shown to result in up to 50% local con-
trol, although significant debilitating risks including fatal
toxicity have been reported (26). Approaches that combine
therapeutic modalities, such as reirradiation and concomitant
chemotherapy, have shown a better chance for long-term
cure, with median survival rates of 1535% for 2 years, al-
though at the expense of increased toxicities and a significant
risk for toxic death (510%) (3, 13, 27, 28). More recently,
approaches using 3D-CRT and IMRT with or without hyper-
fractionation have been reported (2931). Response rates
have been reported as high as 6070% but were associated
with significant Grade 3 and 4 toxicities ranging from 10%
to 40%. However, in many patients, the close proximity of re-
current disease to critical structures, such as the mandible,
spinal cord, and parotid glands, has often made reirradiation
virtually impossible, particularly if the tissue tolerance has
already been exceeded and the time to recurrence interval
is short, usually
REN
7. HongWK, Schaefer S, Issell B, et al. A prospective randomized
rent squamous cell carcinoma of the head and neck. Cancer1983;52:206210.
8. Gibson MK, Li Y, Murphy B, et al. Randomized phase III eval-
Ann Thorac Surg 2003;75:10971101.
radiosurgery for recurrent head and neck carcinoma. TechnolCancer Res Treat 2006;5:529535.
21. Weymuller EA Jr., Alsarraf R, Yueh B, et al. Analysis of the
CHN
ARTICLE IN PRESSuation of cisplatin plus fluorouracil versus cisplatin plus pacli-taxel in advanced head and neck cancer (E1395): Anintergroup trial of the Eastern Cooperative Oncology Group.J Clin Oncol 2005;23:35623567.
9. Emami B, Bignardi M, Spector GJ, et al. Reirradiation ofrecurrent head and neck cancers. Laryngoscope 1987;97:8588.
10. Pomp J, Levendag PC, van Putten WL. Reirradiation of recur-rent tumors in the head and neck. Am J Clin Oncol 1988;11:543549.
11. Stevens KR Jr., Britsch A,MossWT. High-dose reirradiation ofhead and neck cancer with curative intent. Int J Radiat OncolBiol Phys 1994;29:687698.
12. Langer CJ, Harris J, Horwitz EM, et al. Phase II study of low-dose paclitaxel and cisplatin in combination with split-courseconcomitant twice-daily reirradiation in recurrent squamouscell carcinoma of the head and neck: Results of Radiation Ther-apy Oncology Group Protocol 9911. J Clin Oncol 2007;25:48004805.13. Spencer SA, Harris J, Wheeler RH, et al. Final report of RTOG9610, a multi-institutional trial of reirradiation and chemother-performance characteristics of the University of WashingtonQuality of Life instrument and its modification (UW-QOL-R).Arch Otolaryngol Head Neck Surg 2001;127:489493.
22. Young H, Baum R, Cremerius U, et al. Measurement of clinicaland subclinical tumour response using [18F]-fluorodeoxy-glucose and positron emission tomography: review and1999 EORTC recommendations. European Organization forResearch and Treatment of Cancer (EORTC) PET Study Group.Eur J Cancer 1999;35:17731782.
23. Garofalo MC, Haraf DJ. Reirradiation: A potentially curativeapproach to locally or regionally recurrent head-and-neck can-cer. Curr Opin Oncol 2002;14:330333.
24. Langendijk JA, Kasperts N, Leemans CR, et al. A phase II studyof primary reirradiation in squamous cell carcinoma of head andneck. Radiother Oncol 2006;78:306312.
25. Langendijk JA, Bourhis J. Reirradiation in squamous cell headand neck cancer: Recent developments and future directions.Curr Opin Oncol 2007;19:202209.
26. Wang CC. Re-irradiation of recurrent nasopharyngeal carci-trial of methotrexate versus cisplatin in the treatment of recur- 20. Voynov G, Heron DE, Burton S, et al. Frameless stereotactica volumetric approach, clearly has limitations in measuring
response in previously treated patients, in whom scar tissue
may obscure response evaluation. Our data show good agree-
ment between PET and CT for the assessment of CR and PD.
However, 7 of 12 cases of SD by CT scan showed marked
partial metabolic response on PET. Additionally, 2 cases of
PR by CT scan that initially showed an increase in FDG up-
take were ultimately were confirmed as PD on subsequent
follow-up. These data suggest that FDG-PET is a more sen-
sitive surrogate early biomarker of beneficial response to
treatment than CT imaging alone. Although a standard
method to measure metabolic change in the assessment of
therapeutic response remains to be established, the additional
information provided by PET might provide more reliable
indicators of treatment response (41).
REFE
1. Jemal A, Siegel R, Ward E, et al. Cancer statistics, 2007. CACancer J Clin 2007;57:4366.
2. Munro AJ. An overview of randomised controlled trials of ad-juvant chemotherapy in head and neck cancer. Br J Cancer1995;71:8391.
3. Forastiere A, Koch W, Trotti A, et al. Head and neck cancer.N Engl J Med 2001;345:18901900.
4. DeConti RC, Schoenfeld D. A randomized prospective compar-ison of intermittent methotrexate, methotrexate with leucovorin,and a methotrexate combination in head and neck cancer. Can-cer 1981;48:10611072.
5. Hong WK, Bromer RH, Amato DA, et al. Patterns of relapse inlocally advanced head and neck cancer patients who achievedcomplete remission after combined modality therapy. Cancer1985;56:12421245.
6. Fontanesi J, Hetzler D, Ross J. Effect of dose rate on local con-trol and complications in the reirradiation of head and neck tu-mors with interstitial iridium-192. Int J Radiat Oncol Biol Phys1989;17:365369.
SBRT for recurrent SCCONCLUSIONS
The present study represents the first prospective, Phase I
clinical trial of SBRT reirradiation in head-and-neck cancer.
Prior studies were retrospective or combined patients with
different cancers (20, 42, 43). We did not reach an MTD,
and we did not appreciate late toxicities in our patients; how-
ever, we had a relatively short follow-up period. Stereotactic
body radiotherapy seems to be feasible, well-tolerated, and
a potential alternative to surgery or external beam radiation.
Stereotactic body radiotherapy may be a more convenient
and effective form of reirradiation given the relatively short
time required for delivery of the scheduled treatment frac-
tions. On the basis of the results of this trial, we have initiated
a Phase II clinical trial incorporating concurrent cetuximab
with SBRT.
CES
apy for unresectable recurrent squamous cell carcinoma of thehead and neck. Head Neck 2007;30:281288.
14. Denekamp J, Stewart FA, Douglas BG. Changes in the prolifer-ation rate of mouse epidermis after irradiation continuous label-ing studies. Cell Tissue Kinet 1976;9:1929.
15. Chen FD, Hendry JH. Residual skin injury after repeated irradi-ation: Differences observed using healing, macrocolony, andmicrocolony endpoints. Int J Radiat Oncol Biol Phys 1988;15:943948.
16. Stewart FA. Re-treatment after full-course radiotherapy: Is ita viable option? Acta Oncol 1999;38:855862.
17. Adler JR Jr., Murphy MJ, Chang SD, et al. Image-guided ro-botic radiosurgery. Neurosurgery 1999;44:12991306, discus-sion 13061307.
18. King CR, Lehmann J, Adler JR, et al. CyberKnife radiotherapyfor localized prostate cancer: Rationale and technical feasibility.Technol Cancer Res Treat 2003;2:2530.
19. Whyte RI, Crownover R, Murphy MJ, et al. Stereotactic radio-surgery for lung tumors: Preliminary report of a phase I trial.
d D. E. HERON et al. 7nomatreatment techniques and results. Int J Radiat OncolBiol Phys 1987;13:953956.
27. Haraf DJ, Weichselbaum RR, Vokes EE. Re-irradiation withconcomitant chemotherapy of unresectable recurrent head andneck cancer: A potentially curable disease. Ann Oncol 1996;7:913918.
28. De Crevoisier R, Bourhis J, Domenge C, et al. Full-dose reirra-diation for unresectable head and neck carcinoma: Experienceat the Gustave-Roussy Institute in a series of 169 patients.J Clin Oncol 1998;16:35563562.
29. Salama JK, Vokes EE. Concurrent chemotherapy and re-irradi-ation for locoregionally recurrent head and neck cancer. SeminOncol 2008;35:251261.
30. Biagioli MC, Harvey M, Roman E, et al. Intensity-modulatedradiotherapy with concurrent chemotherapy for previously irra-diated, recurrent head and neck cancer. Int J Radiat Oncol BiolPhys 2007;69:10671073.
31. Lee N, Chan K, Bekelman JE, et al. Salvage re-irradiation forrecurrent head and neck cancer. Int J Radiat Oncol Biol Phys2007;68:731740.
32. Emami B, Marks JE. Retreatment of recurrent carcinoma of thehead and neck by afterloading interstitial 192Ir implant. Laryn-goscope 1983;93:13451347.
33. Jeremic B, Djuric L, Mijatovic L. Incidence of radiation myeli-tis of the cervical spinal cord at doses of 5500 cGy or greater.Cancer 1991;68:21382141.
34. Dawson LA, Myers LL, Bradford CR, et al. Conformal re-irra-diation of recurrent and new primary head-and-neck cancer. IntJ Radiat Oncol Biol Phys 2001;50:377385.
35. Creak AL, Harrington K, Nutting C. Treatment of recurrenthead and neck cancer: Re-irradiation or chemotherapy? ClinOncol (R Coll Radiol) 2005;17:138147.
36. Murphy BA, Ridner S, Wells N, et al. Quality of life research inhead and neck cancer: A review of the current state of the sci-ence. Crit Rev Oncol Hematol 2007;62:251267.
37. Rogers SN, Ahad SA, Murphy AP. A structured review andtheme analysis of papers published on quality of life in headand neck cancer: 2000-2005. Oral Oncol 2007;43:843868.
38. Andrade RS, Heron DE, Degirmenci B, et al. Posttreatment as-sessment of response using FDG-PET/CT for patients treatedwith definitive radiation therapy for head and neck cancers.Int J Radiat Oncol Biol Phys 2006;65:13151322.
39. Porceddu SV, Jarmolowski E, Hicks RJ, et al. Utility of positronemission tomography for the detection of disease in residualneck nodes after (chemo)radiotherapy in head and neck cancer.Head Neck 2005;27:175181.
40. Yao M, Graham MM, Smith RB, et al. Value of FDG PET inassessment of treatment response and surveillance in head-and-neck cancer patients after intensity modulated radiationtreatment: A preliminary report. Int J Radiat Oncol Biol Phys2004;60:14101418.
41. Shankar LK, Hoffman JM, Bacharach S, et al. Consensus rec-ommendations for the use of 18F-FDG PET as an indicator oftherapeutic response in patients in National Cancer InstituteTrials. J Nucl Med 2006;47:10591066.
42. Ahn YC, Lee KC, Kim DY, et al. Fractionated stereotactic ra-diation therapy for extracranial head and neck tumors. Int JRadiat Oncol Biol Phys 2000;48:501505.
43. Le QT, Tate D, Koong A, et al. Improved local control withstereotactic radiosurgical boost in patients with nasopharyn-geal carcinoma. Int J Radiat Oncol Biol Phys 2003;56:10461054.
8 I. J. Radiation Oncology d Biology d Physics Volume-, Number-, 2009
ARTICLE IN PRESS
Stereotactic Body Radiotherapy for Recurrent Squamous Cell Carcinoma of the Head and Neck: Results of a Phase I Dose-Escalation TrialIntroductionPatients and MethodsResultsPatient characteristicsDose escalation and toxicity assessmentObjective responseTumor size changes and metabolic response to SBRTQuality of lifePatterns of failureSurvival
DiscussionConclusionsReferences